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xen/p2m: Check for auto-xlat when doing mfn_to_local_pfn.

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Most of the functions in page.h are prefaced with
	if (xen_feature(XENFEAT_auto_translated_physmap))
		return mfn;

Except the mfn_to_local_pfn. At a first sight, the function
should work without this patch - as the 'mfn_to_mfn' has
a similar check. But there are no such check in the
'get_phys_to_machine' function - so we would crash in there.

This fixes it by following the convention of having the
check for auto-xlat in these static functions.

Signed-off-by: Mukesh Rathor <mukesh.rathor@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
This commit is contained in:
Mukesh Rathor 2013-12-13 12:09:28 -05:00 committed by Konrad Rzeszutek Wilk
parent 1fe565517b
commit fc590efe66
1 changed files with 6 additions and 1 deletions
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7
arch/x86/include/asm/xen/page.h
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@ -167,7 +167,12 @@ static inline xpaddr_t machine_to_phys(xmaddr_t machine)
*/
static inline unsigned long mfn_to_local_pfn(unsigned long mfn)
{
unsigned long pfn = mfn_to_pfn(mfn);
unsigned long pfn;
if (xen_feature(XENFEAT_auto_translated_physmap))
return mfn;
pfn = mfn_to_pfn(mfn);
if (get_phys_to_machine(pfn) != mfn)
return -1; /* force !pfn_valid() */
return pfn;